/*
 * Copyright 2010 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package de.google.android.apps.iosched.util;

import android.os.Bundle;
import android.os.Handler;
import android.os.ResultReceiver;
import android.util.Log;

/**
 * Proxy {@link ResultReceiver} that offers a listener interface that can be
 * detached. Useful for when sending callbacks to a {@link Service} where a
 * listening {@link Activity} can be swapped out during configuration changes.
 */
public class DetachableResultReceiver extends ResultReceiver
{
	private static final String TAG = "DetachableResultReceiver";
	private Receiver mReceiver;

	public DetachableResultReceiver(Handler handler)
	{
		super(handler);
	}

	public void clearReceiver()
	{
		mReceiver = null;
	}

	public void setReceiver(Receiver receiver)
	{
		mReceiver = receiver;
	}

	public interface Receiver
	{
		public void onReceiveResult(int resultCode, Bundle resultData);
	}

	@Override
	protected void onReceiveResult(int resultCode, Bundle resultData)
	{
		if (mReceiver != null)
		{
			mReceiver.onReceiveResult(resultCode, resultData);
		}
		else
		{
			Log.w(TAG, "Dropping result on floor for code " + resultCode + ": " + resultData.toString());
		}
	}
}
